/**
 * Copyright 2011 FeedDreamwork SIG
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package org.feeddreamwork;

import java.util.*;

import com.google.appengine.api.datastore.*;

import net.sf.jsr107cache.*;

public final class UpdateUtils {
	public static void prepareUpdate() {
		try {
			Cache cache = CacheManager.getInstance().getCacheFactory()
					.createCache(Collections.EMPTY_MAP);
			cache.clear();

			DatastoreService datastore = DatastoreServiceFactory
					.getDatastoreService();

			Query feedResultQuery = new Query("FeedResult");
			for (Entity feedResult : datastore.prepare(feedResultQuery)
					.asIterable())
				datastore.delete(feedResult.getKey());

			Query pageInfoQuery = new Query("PageInfo");
			for (Entity pageInfo : datastore.prepare(pageInfoQuery)
					.asIterable())
				datastore.delete(pageInfo.getKey());
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}

	private UpdateUtils() {
	}
}
